Dental swaging apparatus.



FRANK L. ARGALL, OF SAN J OSE. CALIFORNIA.

DENTAL SQWAGING APPARATUS.

Specification of Letters Patent.

zatenteor may 22, 1906.

Application filed October 25.1904. Serial No. 229,988.

To all whon't it may concern:

Be it known that I, FRANK L. ARGALL, a citizen of the United States,residing at San Jose, in the county of Santa Clara and State ofCalifornia, have invented certainnew and useful Improvements in DentalSwaging Apparatus, of which the following is a specification.

This invention relates to an improved swaging device for forming dentalplates or crowns, the object of the invention being to provide a strong,simple, and convenient device of this character.

' A further object of the invention is to provide means whereby the dieon which the plate is to be swaged can be removed intact from theapparatus.

In the accompanying drawings, Figure 1 is a vertical section of theapparatus. Fig. 2 is a plan view thereof. Fig. 3 is a horizontal sectionof the apparatus. Fig. 4 is a vertical section of the base on the line 44 of Fig. 3. Fig. 5 is a vertical section of the flask-cavity with theparts in position for use.

Referring to the drawings, 1 represents a suitable base, having formedintegral therewith diametrically opposite standards 2, bent inward atthe top to support a collar 3, threaded on the inside to receive athreaded retainer 4, which rests upon the upper section 5 of the flaskin which the plate is'to be swaged. The lower flask-section 6 is laidupon the base 1 and has a circular shoulder 7, which fits within acircular recess 8, formed in the lower edge of the upper flask-section.

The lower flask-section 6 is formed with a cavity 9 to receive the die10, onto which the plate 11 is to be swaged. This die is a cast of themouth in fusible metal, the casting of the die being made upon the lowerflask-section, so that the under part of the die is run or cast in thecavity 9. It is often the case that after using the die to form theplate the fusible metal is immediately melted over again for otherpurposes; but, on the other hand, it may also happen that it is desiredto preserve the die, while at the same time using the apparatus forother operations, and the cavity 9 is so formed as to permit this to bedone, for it is made with an upwardly-inclined bottom slopingcontinuously to the surface at one side, as shown at 12, the cavitywidening from its deepest portion to the shallow end 12 thereof, asshown, and the sides of the cavity being undercut, as shown at 13. Withthis construction a die seated in the cavity on the lower flask-sectioncan without being destroyed be readily removed thereon by giving agentle tap thereto at the narrow deep end thereof.

The retainer 4 is hollow and is threaded internally in its upperportion, as shown at 14, and within the same is screwed a hollow screw15. A plunger 16, having a head 17, slides through the smooth bore ofthe hollow screw 15 and has a shoulder 18, against which the bottom ofthe screw 15 can rest.

The operation of the apparatus is as follows: The die 10 having beencast upon the lower flask-section 6, the plate 11, which is to be swagedto the form of the die, is laid over the die. Then rubber or cloth 20 islaid over the plate. Then a body of paraflin 21 is placed upon the lowerflaslcsection. The upper flask-section having been placed in position,the screw 4 is screwed down to hold the flask so formedflrmly together.Then the screw 15 is screwed down into the flask-cavity as far aspossible, compressing the paraffin. Then when no further compression cantake place by this means the plunger 16 is given a powerful blow, stillfurther compressing the parafin and separating the shoulder 18 from thebottom of the screw 15. This permits of the screw 15 being screwed downa little farther until the lower end thereof meets the shoulder 18, whena blow is given to the plunger, and the screw is again screwed down, andso on, until the paraffin will bear no further compression, and theplate is swaged to the die.

It will'be understood that my invention is not limited to the preciseform of apparatus herein shown, as the form of the base and the neck andthe shape of the flask-sections and of other parts of the apparatus maybe varied without departing from the spirit of my invention, nor is myinvention limited to the use of paraflin as the deformable materialwithin the flask, as other suitable material may be used.

I claim 1. In combination with flasksections, means for firmly holdingthe two together to form the flask, a screw having a smooth bore, a pluner sliding in said bore and entering the flas ccavity, the plungerhaving a shoulder engaging the screw to limit its outward movement, theparts being provided with means for enabling the screw to be screwedtoward the cavity, substantially as described.

2. In an apparatus of the character described, the combination of upperand lower flask-sections, means for holding said flasksections togetherformed with an internallythreaded passage for a screw, a screw screwedinto said passa e and having a smooth bore, and a plunger sliding insaid smooth bore, its inner end entering the flask-cavity and having ashoulder engaging said screw to limit the outward movement of theplunger, substantially as described.

3. In an apparatus of the character described, the combination of upperand lower fiasksections, means for holding the flasksections to ether,one of said flask-sections having a die-cavity, the bottom of which.

slopes continuously upward to the surface of the section, whereby thedie can be driven transversely'out of the cavity, and means forcompressing material in the flask-cavity, substantially as described.

4. In an apparatus of the character described, the combination of upperand lower flask-sections, means for holding the flasksections together,one of said flask-sections having a die-cavity, the bottom of whichslopes continuously upward to the surface of the section, and the sidesof said die-cavity flaring outward toward said shallow portion, wherebythe die can be driven transversely out of the cavity, and means forcompressing material in the fiask-cavity, substantially as described.

5. In an apparatus of the character described, the combination of upperand lower flask-sections, means for holding the flasksections together,one of said flask-sections having a die-cavity, the bottom of whichslopes upward to the surface of the section, and the sides of saiddie-cavity being undercut and flaring outward toward said shallowportion, whereby the die can be driven out of the cavity, and means forcompressing material in the flask-cavity, substantially as described.

6. In an apparatus of the character described, the combination of asuitable support having standards and'a collar supported by saidstandards, upper and lower flask-sections on said support, a threadedneck in said collar bearing down upon the upper flasksection andmaintaining the flask-cavity closed, said neck being hollow and threadedinternally, a screw screwed into said internally-threaded neck andhaving a smooth longitudinal bore, and a reciprocating plunger in thebore of said screw, substantially as described.

7. In an apparatus of the character described, the combination of asuitable support having standards and a collar supported by saidstandards, upper and lower flask-sections on said standards, upper andlower flask-sections, on said support, a threaded l neck in said collarbearing down upon the upper flask-section and maintaining theflaskcavity closed, said neck being hollow and threaded internally, ascrew screwed into said internally-threaded neck and having a smoothlongitudinal bore, and a reciprocating plunger in the bore of saidscrew, said plunger having a shoulder engaged by said screw to limit theoutward movement of the plunger, substantially as described.

In witness whereof I have hereunto set my hand in the presence of" twosubscribing witnesses.

FRANK L. ARGALL.

Witnesses:

E. H. WILLIAMS, W. H. BRUNDIDGE.

